307.5, 308, 308.5, 309, and 310 Mini Hydraulic Excavator Machine System Caterpillar

Swing Speed and Swing Drift on a Slope - Check

Usage:

308 GG8

Specification

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Table 1
Swing Speed
Item	Specification
Swing Time (sec/90deg)
Right Swing	4.0 sec or less
Left Swing	4.0 sec or less
Swing Drift⁽¹⁾ mm (inch)
Drift⁽²⁾	0 mm (0 inch)

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⁽¹⁾	Loaded bucket : 375 kg (826.73 lb)
⁽²⁾	Maximum for three minutes

References

Note: The engine speed and/or the machine configuration that is used during this test can affect the results of this test.

Reference: Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for the engine speeds that were used for this test.

Reference: Testing and Adjusting, "Operational Checks" for the machine configurations that were used for this test.

The relief valve pressure settings must be set to the relief valve pressure specification before performing this operational check.

Reference: Testing and Adjusting, "Specifications".

Measuring the swing speed on a slope will determine if there is a need to check the swing motor. Measuring the swing drift on a slope will determine if there is a need to check the swing parking brake.

Required Tools

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Table 2
Required Tools
Description	Qty
Tape Measure	1
Stopwatch	1

Test Preparation

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Illustration 1	g06364963
(A) 12 degrees

Place the machine on a slope of 12 degrees. Refer to Illustration 1.
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Illustration 2 g06194809

(A) Upper frame
(B) Undercarriage frame
(C) Marking
To indicate the relationship of the two positions, put a mark (C) on the inner race and the outer race of the swing bearing. Refer to Illustration 2.
Ensure that bucket is close to the implements.
Ensure that front implements, bucket cylinders, and swing control are there maximum reach positions.
Position of the bucket should above the ground so that the bucket will not come in contact with any obstacles.
The upper structure should be at a 90 degree angle to the lower structure.
For a swing drift on a slope make sure that hydraulic activation lever in the unlocked position.

Test Procedure

Swing Speed on a Slope

Complete the following steps to measure the swing speed on a slope.
1. Start the engine.
2. Place the engine speed dial in the HIGH IDLE position.
3. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
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  Illustration 3 g06365026
4. With the swing control fully shifted, measure the time that is required to swing the upper structure from position (X) to position (Y). Refer to Illustration 3.
5. Measure the time that is required to swing the upper structure from position (X) to position (Y).
6. Change the position of the upper structure at position (Z).
7. Measure the time that is required to swing the upper structure from position (Z) to position (Y).
8. Refer to Table 1 for specification.

Swing Drift on a Slope

Complete the following steps to measure the swing drift on a slope.
1. Position the upper structure at position (X). Refer to Illustration 3.
2. Start the engine.
3. Place the engine speed dial in the LOW IDLE position.
4. Leave the machine in this position for 3 minutes. Measure the swing drift on the circumference of the swing bearing. Refer to Illustration 2.
5. Change the position of upper structure at position (Z). Refer to Illustration 3.
6. Repeat Steps 1b through 1d.
7. Refer to Table 1 for specification.